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Chem 101 Flash Cards Chapter 2 Scientific notation
Scientific Notation for chemistry
5
Chemistry
Undergraduate 1
09/24/2010

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Term
A Graduated cylinder has a mass of 75.072g. 2-propanol, a liquid with a density of 0.7845 g/mL, is added. The total mass is now 84.926 g. A small piece of metal is added. It sinks to the bottom of the cylinder the total mass is now 140.369 g and the volume reading is 18.36 mL. What is the density of the metal?
Definition

Mass of metal is 140.369g- 84.926g = 55.443g. 18.36 mL = volume of metal and 2-propanol. Mass of 2-propanol 84.926g -75.072g=9.854g.

9.854g x 1mL/0.7854gm = 12.54649 mL

 

Term
A patient is to be given 125mg of ampicillin per kg of body weight. The ampicillin is available as a 0.200g/mL solutionwhat volume of this solution should be given to a 113pound patient? (1 pound = 453.59237 g)
Definition

113 lbs x 453.89287g/1 lb x 1/1000g x 125 mg ampicillin/1kg body weight

 

= 6406.992mg ampicillin

 

6406.992mg x 1g/1000mg x 1mL/0.200g = 32.035mL

 

Give the patient 32.0 mL

Term

A mixture of two solids is 37.9% barium chloride. What mass, in kg, of the mixture contains 450.0 g of barium chloride?

 

 

Definition

37.92 g BaCl2/ 100.00

450.0g BaCl2

 

1.187 kg mixture

Term

If 20.00 cal of energy are given 40.00g of metal X the temperture of X increases by 18.0° C.

 

If 20.00 cal of energy are given to 20.00 of metal x, how much will the temperature go up?

Definition

36°

 

20.00 cal is proportional to 40.00 g x 18 °C

20.00 cal times 20 g a° C

 

If 20.0 cal of energy are given to a sampleof metal X and the temperature goes up by 12°C what is the mass of the sample?

 

40.00 g X 18° C/12.0° = 60g

 

How much energy would be required to raise the tempertature of 30.00g of X by 36.0° C?

 

20.00 cal/40.00 g x 18.0°c = Xcalories/30.00g x 36.0

Term
For any given subsance
Definition

energy/mass times temperature change = a constant. This constant is called the specific heat. What is the specific heat of metal X?

 

20.00 cal/20g * 36.0

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